Small and Large Stones of Programming

A Perl program that sends a voice stream using RTP (Real-time Transport Protocol) is show below. The default codec for input voice is 16-bit linear, but u-Law (G.711) and some other codecs can be used. The port numbers and the IP address of the receiver are specified in this program ($REMOTE_PORT_RTP, $LOCAL_PORT_RTP, $ip, etc.). RTCP (Real-Time Control Protocol) can also be handled, but no specific control is intended. A detailed description will be given in future, but it will be explained when it becomes necessary.

A program that can be used when changing video size by removing part of each frame, which is required for, for example, image recognition. The usage is as follows.

clip(inFile, outFile, options...)

inFile is the input file, andoutFile is the output file. outHeightMin and outHeightMax specifies the vertical range of the output frame. outWidth is the width of the output.